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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c3147740b3d442bcbfd7b78542b744fd68b9b1f57bb4ef6647b49326f662124' 
  AND token = '2nbwucCkmloLsLAuE/n/zTDjJQEEOpMqRGgKozECdq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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