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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44fd0f43768ec3056f16520ac2e6349d38b486f0ee9027db8e6cf34d42317d71' 
  AND token = 'L/5daF7Uf93EZJwR0V620JNGbaAGnfD4KU6LdQDTQdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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