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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9cecb8e893f68b20a00400cb9b3ec1d246056ba7271ac8d15d06806d66d6262' 
  AND token = 'yIWTKXcIzO4UNvXlarZjs/lfUDVo5UxOTY9AfyOCrj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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