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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '605ab005d7954217d949c7e327b8d62b4539d8dd2bc794f2bdd40b356b04c96c' 
  AND token = 'clSjat9TdUDbJWHR1z7JhQmBerRv+b7uVHA0xdfWrOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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