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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e65f1632cca411ea01353eeaa66a2b144bd11f2efa56078483ce9a4f01774ce' 
  AND token = 'KvTdJWWHnoStkySEiVhiMY4cggGzdGzjBBQk9YQHlvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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