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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38d904eb07b5e8820e6b6fe8a9ab4c23507245955415db160bf734118f3f5483' 
  AND token = 'uuc51hB+daZI+Y8ikeUBXY8GU2AApH16S99NKt/E254=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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