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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a7e65526f56c07085f393e5d69d5c00a62c7773594a71d741b039715fc21408' 
  AND token = 'Mpuy9O3DEfOvlY03Uh3GJwKtdt7r6VDL0p9qfuVIuTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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