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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2656ba3a7099cbb42ee072c073be3087cff8e628a34d035aa642debd6f3d7bcf' 
  AND token = '9TKntDSC4zhbcNeMj3ia2J6H7Ru+zxnfum2FDwX9I60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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