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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9eafcdab1f695f791a8901234dc4118ad65f57d16969160073f4b91c7d264b2' 
  AND token = '9kZFNzH79KJwopzP5R6122t3hu81jK4PdgJkNVrXaYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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