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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c6f3e298f71ddcda9d0749b11969ac05cd01342cc42a8ee0bd5562f5d40f4b0' 
  AND token = 'o2fis9+hHrFPFkE2PIhaJRIzk0/M9mXxPBTcT/J042Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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