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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd85a2848fda112453ffb21fdfc8c512c5e514644d61cbf2ea9367013a513a9e0' 
  AND token = '+82w+lTtCu8bj/4EHF08xTiX36xT3i+f7wX4KXhA9P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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