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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '089050c662a2380c11c515e9d03aa99ddf47a5c83cffc50ed01adadcb4290c1b' 
  AND token = 'T0VvKHwKpKlhW1q+u2571TXlBJlccoWUMTx01i5zlLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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