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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ef7da0a734ba20160e89e913439d4c09ca475f730ac90167f850bda134384b' 
  AND token = 'jiYeSjs5Cm4myUt9LbLdibxAjWhPD7ol/oVLb1DJ4m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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