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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c4a0394801347a79ee23f08ae3e0102a232edf96cc79916c36cead11a11de13' 
  AND token = 'BlThDoMJ1xie4F2qMqe0GLzhurSZ/Aar08BoTlik72I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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