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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '785a39b53d58d16f104976cfc74fb56707e45e6ec9f1909ec1b2f76ac35a688c' 
  AND token = '3KdDil0Y/x7enO7YL6Qz4r0wtLkRpW3mDpQ4DjjpjV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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