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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1c96f52921096114340696921634b8ba53a03114babe9e2b37d8355e7ae8e61' 
  AND token = 'Oz2yUo6UCwZsSBEH38ESt7LaBSahvDQDO/cSmwCSpmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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