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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90ffc65efe3984e8848e90cc12efca8c58910e4cf6f911946fa210dd4d87ee45' 
  AND token = 'EprekY8dObapvghnOIqUuYmMS7u2BEH2nqjftnQ/JOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}