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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83dcb6675e0ba34116bc185bd601c159426f68b711c1efa065744493aa8c1f36' 
  AND token = 'kert8194TnpPL+Eag5EGdNDHy5Z3qBli3CaakxzOLA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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