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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f3203c11bdb9d8746678bf6ea118a26ab19c6f6a42618deea1c550b8bd68676' 
  AND token = 'i2lv14UYSiPlR1PC9ePJUhsbcYrMd3R/6wCunANj96I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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