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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05d8468ded8ae6e838a8efbe9a86c25df3ee864b021c64abf8713cc283043a53' 
  AND token = 'lumIL3oKxffd93cW7pnk78ak3nxw6b0UQlZ5GIm39Iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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