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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52c946286b96382ba853616abb1f94fa6dd605e9a0c5b28c49cdf3df6a7e4988' 
  AND token = 'Y7N2fBPFrRsTLks9OZYlIgkYv9UKXbcE38B9+ztneXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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