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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4699c28d0203b2a66cce68b5edc0ba49d38e42886c98d394564de9d411882bc5' 
  AND token = 'xvs4RdWxygsxK7eq0XPg/KixIiZgNQ1g2k32OXhkSdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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