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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2625fe58067e080b76841911f86c68b3be67119ac81c8a542bc92ede2ccb8c0' 
  AND token = 'NV0QWcrUPOImEoZ+VuarRGFGIWg0hTWE9meXowC7prg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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