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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1fd1295c74696aa6f858a178ee918a4905a43d5e50d589c5d0cc6753efcc6af' 
  AND token = 'r34IlWRPa68zCv4+XotJ5cl5bXPWu+iysO9hfzguPl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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