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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '070d54c3b9aef5652e5de75eb47d5faf34cd4c39074dd119dbcf029914842e19' 
  AND token = 'b8s3GeZr1m94i1FEH7sQ94s4EPjgFtZLb4aq8gDtoRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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