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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c17d36dc81af1ca3b5594ecb0f0847442caf17e0fbf82fb7e87b4a9d6e522a00' 
  AND token = '0TxVHSIwpnrmxMMG5xwVn2OPIKK1MdvD6kgbPaZyqq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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