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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dc3ed29b36ef2be7c12a8eb0248d7913cb7c35a37c3a6ebd7c02db3922b50d0' 
  AND token = 'TVtUbUDVhtkpTq+WVv2Dxdk7YOQndLbv2q1R2DZ84XY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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