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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f32cbf67d9dbc49c61cea75a31b754ea00fc4cafebe31a0d44e38550d1ba3ac6' 
  AND token = 'mhrNicCg/6SKe13KpyM1kEckeYuRs8Tzub0v93fZhBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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