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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '832c7535431da2b75286317d5b4a22e0df5201305905977db445845b0a67f41d' 
  AND token = 'BTIj2tU/ES8or7O+2FHHc3SGlEhEV1RujD/lbV/g4Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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