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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca10b6237de269db7c7cbf19cd56d7a323e319e60265ff81507a18d6d6367bfe' 
  AND token = 'SMQ4N5p9ITBUPNWg9f+6v7VsEY+RONj1Wi31kPJsG44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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