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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05b70aa2518376bea5e80713cb2b6450a0625e269e334d5c5b6e6d1d83ee9580' 
  AND token = 'NmAOeG4jhD+WDnv/dPKaX7//cpbeJuHiUw30EcK0HMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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