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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ec6ce3a45b8a1c237c5f3765dedb01775b6ea5206f6654def461efc871f069b' 
  AND token = 'Zu3PONaWPmA9MYE6atv6yCfP/Ik6/BZdXge1c0AVMUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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