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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09f4c014b0d62ad28504c5a406ed5df002e0ce49dc1d0d34a20e6a3874c98c10' 
  AND token = '+1Fmcc9RmISUdVt5WNoy8RsHsVKyJls58SxxBU8TCJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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