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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ada8b868fd6e8cd78398eccec72bb2cb59b8b6384db86e35700cf2ae7280993e' 
  AND token = '5HQg6taLVwr0xbwQiQxiqUhp2Qllc8ywNIizDj0gTJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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