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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '569dacb4dd86b58194cc04eb6738ceb962de1b4ab36ceaeb974250cb8aba6601' 
  AND token = 'jX03UE9JDDJ+gjUOu3c+jjCHr47JK2JUCtZ/4Vtcy0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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