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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38763a5d6906824679f6d86945b267ee3bb9ddf82903c8d497837d7dc0a73980' 
  AND token = 'FQjeEgcSXTYYXuK6lZUH16iUUI/l5xFP91yoFOs08JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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