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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a073e4fb60d95c9e64b999787bb902f6b44a1e5ec0c3fb88d0211c0949f1c6c5' 
  AND token = 'u8hvlCeyaHYuBNP8K13sY9bUiLd3mHevqHp2QOIyWss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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