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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf37be4b0bb56900e87031457563a4af0bdf1f793c77b3ae3a61ba508d02de26' 
  AND token = 'GRdKQTxZAUnVAYcd87yjdY+iMMmf+gIlhLK0kt8mszE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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