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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '975a9fff7cee57b2a196cc5f11e74dcd1d133ef53f75f0d672e29ee5f3fab29a' 
  AND token = 'ZHY0tS0zSR9RqpEtyXyPIo7YwIxePPMNFSGDTL1ejig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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