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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7678c9f48f7652f79387687a066f31b22c5aadd47a2a44e4296007f9b575ccb' 
  AND token = '8dh5oiINQ9S/Gc2RyfQng45UL10GkKfCJWXmGiUwkFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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