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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a25ae6288d07ca3182a47ae40bfdc82181dd3bed7e4c3f2e1d7777f5bcd685a9' 
  AND token = 'rhYouyTBZXhpFE8kU6d6IIsgJrybigp72UKTkDQmI44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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