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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd597d134bb2eb243bf73ff7650f7c0200d23c0e5c849b6015de961d74be6fa7b' 
  AND token = 'Y88FbTYlOLYKDYoMvvPa3M/7kZQuVP3vthG8EW9X1N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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