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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd68a36d1d3ed1deb532c8bb50521c831310d6f5448369bdc9001497fbab5b7b5' 
  AND token = 'ZZZiY4eMX+Ixy9JTaZVUbyBNx8i+HY/7M8oHKBnmtj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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