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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fed1b146c4211a22f1d89c0cc40dc88fa8c6f8549f288a6f73c27a08bbf038f4' 
  AND token = 'NVc93rjrpmS3iz89mSFCwfXnB9/0yk9TVsZHMl3807g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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