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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2297c3e3ec0ce7d965d9594226ef2c833e1dd840b96750927226f81f8d5e787' 
  AND token = '9rpAZym/i4TfuDHb2tlTAWsFCqyhjaAcxgEvBBYqoss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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