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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4a70830220b6e45506872563d6f5aaadf5ce0e337d34f3b83b24ecc53f5c063' 
  AND token = '3V2CvfJw/tdijiwz5JkCStAZ48WAONCDRqDU6HsFzvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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