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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b5f7d6968a354f4f127b626abc8e8d3ad23c7ce813deaedca689e01f06a8931' 
  AND token = '9vEFMQNEDpd1d5gyo04hv6vgHh2+pGT5sbkdVf7sCA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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