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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c356c5711eea3074bd4aaa450bff32b8e42ec0152c5b46027f908977c340fe3e' 
  AND token = '0k+EiAk1Y9W4GJYtCYx72+8lLgJJ4MWK+O2e2Zi2j/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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