SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '106cbf8bbb3f47e30a592e43ac7ee8d2b1c5c618f9b4a5407ae49f562afeb564' 
  AND token = 'cfbRZXtjUn1swpKdHL9agqnXnq/F+AuswefVz3PWa+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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