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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd4a1a01352abe51127072edd04195bb0abe956a4a78687317bd25359023df5e' 
  AND token = 'mBjnGXcQ5TcIbbMgHNS7nGd0xyk9AgPOHrp0Jg5nxq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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