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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cfc4657139e296de231b43941deeab55615ecc482a2c8ecc9384f946699097d' 
  AND token = 's6gxjZWs0DvdYx6abHQSIN/rUk0RA/VnzC+sIWjn59I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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