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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e556d25d5107cb4a7a064ea501ed1928807138a4947a160e1b1d11d3f8591da8' 
  AND token = 'TA3sT2KQIpM0n7ZyWxhEq3Jaqoguoz9h0YEu2ljkl6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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