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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a26fb3f4972c879224eb981d1abb30051d425b1ccdc589654bd51640127d4ddf' 
  AND token = '0FTA23A815p10fEorHdipZCTK/XyFxury7nJRBehBzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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