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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db6627516359fb13639cbf0be0bcac740c51f3c0d8479a14413320b7fa0eecf6' 
  AND token = 'nq/S36mBBq7Miejm5DHObayc1DUzaz20ZH2yaKym6/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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