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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71499e36072ab69677aa173f19736bbce044dcef5dbd0f62999331c6ed1093a9' 
  AND token = 'Ykdsew817Dp4TObP1Zogm+rbICe0wogpz+OpYEQvkPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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