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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd83e62bdb502bd3806f21bdd81ac82dbbda61fcc384242728a5b34369e8ccb9' 
  AND token = 'GvrN5ALFtsJucDmYRmAD+RHTkB1dk3U0iUPhfETn0dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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