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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ffb715b31a60d09e99826fc5de31bd989e785ddd90576450aef73be0689f886' 
  AND token = 'zgMPJzNmS5mn0th6kb+lGsll8ToMAF3lWqwZa5WZzwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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