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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0194cebcc56d454df8013ab141a58ef5304dc68c560f98704cdbe0d16a17c721' 
  AND token = 'QETD4B5XWi/Xg6DF/J4JNOK2rJgyNgYukmtjC0jMLMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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