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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0fe5d3fc3d7249708ef5f5e5ee354f9fab785a1bb72440e33ee855feeb83a26' 
  AND token = 'fQf1fog0YwF8Pg0iSBhT4ykBHvCdKX8cvhBF3t/p9io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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